Little right in maths - I go wrong making chart (9)
I believe the answer is:
histogram
'chart' is the definition.
(histogram is a kind of chart)
'little right in maths i go wrong' is the wordplay.
'little' says to take the initial letters.
'in' is an insertion indicator.
'wrong' indicates anagramming the letters.
The initial letter of 'right' is 'r'.
'maths'+'i'+'go'='mathsigo'
'mathsigo' anagrammed gives 'histogam'.
'r' put inside 'histogam' is 'HISTOGRAM'.
'making' is the link.
(Other definitions for histogram that I've seen before include "Graphic representation" , "Chart showing statistics" , "graph" , "statistical chart" , "plot" .)